Electrodynamic tethers are long, thin wires deployed in space that generate electrical power through their motion in a magnetic field. When the tether moves, it interacts with the Earth's magnetic field, producing a current that can be used to power satellites or other spacecraft. These tethers can also be used for propulsion or orbital maneuvering. By adjusting the current flow, spacecraft can change their trajectory or altitude without using traditional fuel, making them a more efficient option for space missions. This technology is being explored for various applications, including satellite maintenance and debris removal.